Anyone found undamaged core?

I read this post, redid the map, and got mine. It was NOT the last mob of the map, but it was very close to the end.

Aggorat - Undamaged Core -- after clear the map 5th to 7th time, a soul core dropped, and the quest on map was marked complete. Mine was found right through the gate between Rejoyce(maybe I miss spelled, it's a shrine like place you can interact and a lot of text pop up) and piles of bodies and blood, but I don't think place matters. It's just a random drop with really small possibility, mine was dropped by normal a big guy, not rare monster.